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Morphology of phages Sano, Salvo, Prado, and Paz. Transmission electron micrographs show Sano (A), Salvo (B), Prado (C), and Paz (D) CsCl-purified phage particles. Samples were negatively stained with 2% (wt/vol) aqueous uranyl acetate, as defined in Materials and Methods. Bars, 100 nm.
